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Gearbox sprocket, close shave!

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Post by wrighty Sat 01 Feb 2020, 2:29 pm

Had a close shave with the front sprocket the other day. By chance I decided to fit a one tooth bigger sprocket, when I removed the cover I found the sprocket bolt was unscrewing itself. If the sprocket  had come off........at say 60mph........carnage! I seem to remember that when I stripped the bike originally the bolt was well and truly in there. So in my wisdom, to stop it seizing in there I applied a blob of grease to the threads. IDIOT! I've cleaned threads with brake cleaner  and used loctite red (max strength). I find it a bit odd that Honda just use a plain washer behind the bolt, bikes I've had in the past had a lock washer or some such. Anyway lucky I decided to up the gearing or I wouldn't have found it.
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Post by OldRocker Sat 01 Feb 2020, 3:55 pm

Have you never had to clean the crud that builds up and around the front sprocket?
I do mine when I clean and re oil the chain. maybe worth putting on your to do list mate.
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Post by burudi Sat 01 Feb 2020, 5:27 pm

torque nut 5,5 kgm. I consider the perfect alignment of the chain very important, in order to avoid tangential lateral forces.


Last edited by burudi on Sun 02 Feb 2020, 9:12 am; edited 1 time in total
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Post by wrighty Sat 01 Feb 2020, 8:50 pm

OldRocker wrote:Have you never had to clean the crud that builds up and around the front sprocket?
I do mine when I clean and re oil the chain. maybe worth putting on your to do list mate.

Yes indeed. The project wasn't finished that long ago so I was surprised (shocked) at how much it had unscrewed. Should be ok now but definitely on my regular check list.
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Post by Beresford Sun 02 Feb 2020, 12:16 am

Even without a bolt, I don't think there's much danger of the sprocket and chain coming off as the chain restricts the amount of sideways movement of the sprocket.

However there would certainly be much more wear on the splines, sprocket, and possibly the chain, from the assembly rattling around loose.
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Post by wrighty Sun 02 Feb 2020, 7:58 am

Not something I'd want to put to the test affraid
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